Cu—P co-supported zeolite, and selective catalytic reduction catalyst and catalyst for exhaust gas using same

Abstract

Provided are a high-performance Cu—P co-supported zeolite and the like having excellent thermal endurance and catalyst performance. A Cu—P co-supported zeolite comprising at least a small pore size zeolite, and an extra-backbone copper atom and an extra-backbone phosphorus atom supported on the small pore size zeolite, wherein a silica-alumina ratio (SiO 2 /Al 2 O 3 ) is 7 or more and 20 or less, a ratio of the copper atom to a T atom (Cu/T) is 0.005 or more and 0.060 or less, a ratio of the phosphorus atom to the T atom (P/T) is 0.005 or more and 0.060 or less, and a ratio of the phosphorus atom to the copper atom (P/Cu) is 0.1 or more and 3 or less.

The invention claimed is: 
     
       1. A Cu—P co-supported zeolite comprising a small pore size zeolite, and an extra framework copper atom and an extra framework phosphorus atom supported on the small pore size zeolite,
 wherein 
 the small pore size zeolite has at least one framework structure of CHA in measurement by powder X-ray diffractomety, 
 the Cu—P co-supported zeolite has a silica-alumina ratio (SiO 2 /Al 2 O 3 ) of from 7 to 20, 
 the Cu—P co-supported zeolite has a ratio of the copper atom to a tetrahedral site in the zeolite (Cu/T) of from 0.005 to 0.060, 
 the Cu—P co-supported zeolite has a ratio of the phosphorus atom to the T atom (P/T) of from 0.005 to 0.060, and 
 the Cu—P co-supported zeolite has a ratio of the phosphorus atom to the copper atom (P/Cu) of from 1.0 to 1.5. 
 
     
     
       2. The Cu—P co-supported zeolite according to  claim 1 , wherein the small pore size zeolite has an oxygen 8-membered ring structure. 
     
     
       3. The Cu—P co-supported zeolite according to  claim 1 , wherein the small pore size zeolite has a crystallite size of from 10 nm to 50 nm in measurement by powder X-ray diffractometry. 
     
     
       4. The Cu—P co-supported zeolite according to  claim 1 , wherein the small pore size zeolite has a crystallite size of from 15 nm to 100 nm in measurement by powder X-ray diffractometry. 
     
     
       5. The Cu—P co-supported zeolite according to  claim 1 , wherein the Cu—P co-supported zeolite has an average particle size D 50  of from 0.01 μm to 20 μm. 
     
     
       6. A selective catalytic reduction catalyst comprising the Cu—P co-supported zeolite according to  claim 1 . 
     
     
       7. A selective catalytic reduction catalyst formed article obtained by forming a composition comprising the Cu—P co-supported zeolite according to  claim 1  into a predetermined shape. 
     
     
       8. A catalyst, comprising a substrate and a catalyst layer provided on at least one side of the substrate, wherein the catalyst layer comprises the Cu—P co-supported zeolite according to  claim 1 .